Ind. Code § 8-9.5-7-2
(a) Any number of persons, not less than fifteen (15), who are the owners of fifteen (15) separate parcels of real estate in the same city may associate themselves together by written articles of association signed and acknowledged by each person, specifying:
(g) At all times during regular business hours a counterpart of the articles of association, with all amendments, if any, shall be available at the office of the agent of the association for signature by any owner who may desire to become a member by signature of such counterpart and the payment of the membership fee, if any, and the annual dues, if any.
As added by Acts 1982, P.L.77, SEC.1.